Pressure-velocity coupling is one of those CFD topics that separates people who run simulations from people who actually understand what their solver is doing. The incompressible Navier-Stokes equations have no explicit equation for pressure — pressure appears only as a gradient term that enforces the divergence-free constraint on velocity. That mathematical awkwardness is why solvers need coupling schemes like SIMPLE, SIMPLEC, PISO, and Coupled, each with different tradeoffs in stability, convergence rate, and memory cost.

This video promises to walk through the selection criteria for these schemes and how to actually implement them — which is the kind of practical, decision-oriented content that's often missing from textbooks that just derive the algorithms without telling you when to pick one over another. SIMPLE is the workhorse for steady-state; PISO is preferred for transient flows; Coupled solvers trade memory for robustness on stiff problems. Knowing why matters when your residuals stall or your transient solution starts oscillating.

Caveat: the channel has 1 subscriber and no description text, so production quality is unknown. But the topic itself is genuinely technical and the title suggests real engineering content rather than a surface-level overview. Worth a look if you work in CFD or are learning it.